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Learn Python 3 Fundamentals

Solution Review: The Factorial

Explore the factorial function implementation by understanding each line of the recursive Python code. Learn to identify base cases, handle invalid input, and apply recursion for problem-solving using loops and recursion techniques.

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Solution

Let’s explore the solution to the problem of the factorial.

Python 3.10.4
def factorial(n):
    # Base case
    if n == 0 or n == 1:
        return 1
    if n < 0:
        return -1
    # Recursive call
    return n * factorial(n - 1)
print(factorial(5))

Explanation

Here’s a line-by-line explanation of the code for the factorial problem:

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